It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://mit-edu-4590167832-gov.caltech-edu.pp.ua/post/4590167832

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "mit-edu-4590167832-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '911048836809c93b',cH: 'GKSyemLTDoOQdOXI.9Sv43GOZYrEOMpd_hn1MuVKWM4-1739402153-1.2.1.1-cpdhyFaeJHwrbd.KLu8823ufDuD.bbcWjoMFPFaVu6N1dCRIP8Jj4z0i7hdM9m_4',cUPMDTk: "\/post\/4590167832?__cf_chl_tk=VROYpAc4koDx3UgpVE38CPEiPPZqT3ImcqNGK6Me1T4-1739402153-1.0.1.1-8kW7NBOVELk38S_rltp1I4KkIcu9a6REsq6tfjFOV_o",cFPWv: 'b',cITimeS: '1739402153',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4590167832?__cf_chl_f_tk=VROYpAc4koDx3UgpVE38CPEiPPZqT3ImcqNGK6Me1T4-1739402153-1.0.1.1-8kW7NBOVELk38S_rltp1I4KkIcu9a6REsq6tfjFOV_o",md: "II355wndoPJ10wRsj49qhnkwwRSvs5weeg6P3BkuYYY-1739402153-1.2.1.1-KL20V7a5sBidJBecH.fPIkBrwDUR2zcOoscFJ2pa80MRR69Me.ZXYiggJbNUsUZI5y8Ch8RZpUHlmXo1XVYlLIKDGsLLmuU8JpoE3W_vppBrR21WgUyvgDqqpg.5BG3gaHe.MlbJUEbBWp3g7ryRJ4XWdyBRiHYOitOEUVBY7daIidevnH4FBvPpmBlWiL0tMnGrMoLMPB96OGUMa1r3fKMJAwNefL79Ig36Vlgnq9od4lMBMgrwuq5vIMG2XxT444BrFsqSUYtjKx1owufc62A86wfm7jz0pFQzEWPiL2dej.Uj63Zl1ROuGvftJHmNB.zRK_CYXOc8jjuHZ3BuSmX7FYr7u7y.CLg.x1Z.x__DWEwu7PTieCHpKPrMCOkmRvX2bsPc155.aeuTrkLPSkzAS8JD1RfZ7ZUQv4Sk7xOxHeM5z8bNhuQJfK9zV8Dx7sPLWvwlmPvqBelhu2UdhFkAjwmD5ExmxGRXwiB_PW1BRHjanMwCrvwYftxKp_j_TRWL_mXH5X93D2499ObaY9CLkVBoYzO99KOEc0NzB3QhyC5O9JtxTlSnuk7BReuPSbyI89OYPQhffonyv222VSZ.MV44NBizio0lc8ua5ssOZK20AwbuT5tA9GXtjSz_9lXm0YTqALfzq0igU_TKNn8v1W5HEvobLCUg9aJhGkMqC9V5Vctu6CN1nvvLKLkUfEsCHG_KbWu2I06CM.eLTG5MbSmTCrqQRSvWue5DmMCn3uN4WG62cc6NTDoRrvfeXSZrPS0bqsJ0F44peJIE9i2ZAYuSo01Tn_dgbehSuL2pBLui6S.RWT8hTvHQWMoIiISGIVEyezldRLhCngdHITC.6.hpcAzNhjC71nCC8arZ6EXztyupxq2L3fBojTWnwUQvKFkr6evlK9hpXICgrDhxDf3KLPFBTiZlcXcNbN5U4XZkEFzQEl9aSEnzWuDnWTYlTaYkAypRyJxd.u1rlPZVegng2PzDIe1Jv3Zet4he7cVVKHCPRnUmS_7XGjBqj6oLio7ZtSNZn1X5MuAZUckye.aA1KwNYS8iHYZRfcXoyO0jlATyIgTXrdbmS_5TlMqcNqtjVmycPn.AhafkhgnG6eUDX1SaYxwHmZBWnQm2ig_Xj8uSBkCnKocNkUssSDTbZxS1hOLz6hhGOB5dn7.F0H4vkK.9nqn1BPWlgPNXcqBoNldFajmmhVUW6tbjboIuKwo1sLNQuEZerLgkh5irieu55Zw5_2MUOuupNwwidDr3MdJhve412W7Xs7.kGLK3xBsLEYDGWkVgLaX3Ykaa7idj0SI.SImV5YGSnL17K8Jnp14ctBLVERY2PCbdiwgpA5EEVHsd2PaDNJ1mpxygNyT3eh1uujnczHhAbn1G0BdBhypvW0PgQRl6Gl_H35_iMyVsgxACgRmnuB3l814aup0Q8iUj_q4pw0.1KyY4N235irwJSydYr01an04ggI39UmDpSjkBRWROZJpuPHUaeyks9yEMjbT48nnu47SoB_mrQi1igMJch43SP5iVi.jwLnnTp7V3T.WkOchU4pyjuzFM8FvN1teVWGFYMcmotK5nE65QgZuaqGgWipuZbMgTs3AARnbSriFOIyP7KWh5bgiaWMRCQ5Hoi7VJ8LcCA_PZzcPieeSe1BF213oVgk8BICgJCCGac01K3DiTj7kbSHcIinta6QRyNMBwNoaBFtv6Yv8X2Pq55aAyzR2beRSyQzPoMP2ZpjPOjZqwY5SajoVTW9UG1h_GnbBhmhBLXIZM1sbJm9lN.I9d.jAkgHOBIMtDNnnkTnl4HlsZtngT5sUCRLxEDxinDxKRcCeRWcIwBdK0G46I8SK4OPPnnGo84OQEWF_FRYYYM6.Kupjq_CbA_w0bHrwVDjMz_7GF7hA3bjvd7sMR.sVbVsFy3oInfmc2aDptCGEIqwnOZpc4y1OXyt0nrvMk81BkM62dpL_Z14TeAdOLx0JpzEGf_zhIZE5wJreh4DdpN9D2RD8.4udfhYVTiv2kPcdeYGS0gJFA9SuKMSBHZDi0X4Px_.SE7MMnbGFFb8vbSYwqvSK476M.wcNxm5IL3cPKejJE9hPDtKo6WPz8BPE82DrBoLNwxySZxkx0deVP03N0o16P6lpqpb9V_m74FlOPhbAhYiUalaFLujnuAmnt8kAgUv.WxE9tbO_I.FoM1c_1Wjta2ZWqt9tPQVXdLxYG5XA5IFUFp2LhwX.EF3kE3C1b3JhNVubRlK2dAD1UwWziMw",mdrd: "_.J_AjlRzgVOsLwh.RqcEqeHBzOmS5QwF5aWASOJeJw-1739402153-1.2.1.1-S_yFpUzlds3ZR4yCpvSsQSc9rMOL2NT_IgJBPkTj3T2COpEtPFPlgn7alQ2x5lSPRjandosQYN8Ani6pilp2WmEmOK9FSDkfxNMVKUuavDjUbFl4wveNEPViMYUaNOBf.s6LYepT8psgF7giKI_edHBpGMFSUoR0y0cViLpGGwAj0dabPtVKVQe0Toosl2RiDTa_wsEpP9e5_Fun_7kPR0L.c0KCc.u9LgkK4EojytrgHs0NmeNIqPPi55pwmuQshmalH0SrwoM.MjlND.QRcs9.W_PHYeGoJLgJfvA51J1DMjAQ1lJuSpojGwDCenDMWZyV_MKnkaEBMLZ9tVCqtVjDgTeV_YEhue6WpSaLgXj8VcVnMtQ1JkqpxpohT9krRdk.HvM.J6XMUkGe4DYGoWqu6xdPNBGOuF79ju6f5pvvElxUmSVs64q48karMKjSv3amAvvnPtJlEzRqkKj7DnWcdhbo9btT3JmOvuEBr4gmM8SDT1kcQLBD.z3uASxXMaqa1B1i7nnFpk5Jzow4fkUg_IQNibeEDHhqReIO2BWU94N4jR3iIPauFULPtb3GrEWpphtGdKbSQ_a2aoRZbTmltBBxRKfq0HrwXRAuYmyzTsaA_SewGEphOxYksuxDz.dmjgnRzCDAAjkQmUcv5jYm94sX1jiC2ISwoTGUWxOYn3ouD88s2NzBhweRSqKdDcNsrGajYQQXa.O6HUZOoc8Zi7WFpKcu_mLJri6tY7wUotdwLa7rRTbhKMyvs0WfUWoMPn0U1zSVDZzmeev9wzpTAehAPMUFa0VccHlN_ZY9y7W1Fx1Tx5SSl2iKrTmpQcNAZsmtCaqXaePMntImlQth6FrPc7c8pkDXKATe73ZWT300cUVdRehWJiR7CSUQNIdBeKVKJY1yKLCnWAdZSiUtRzgtdlRcaW0aZ2Tr4OQr0o8PB4mg.A82Fgx816a1Jcq.3p9X10KD7yhYlEsUk0Dzs7Td.QKOb2.y3lODHKIGp.0CG4t7RNsbl_QT.stmtSCiwERPt3Ay8o2axotG.VHQ.mVsas_L7t_alDl4bhDCMdG5Is6v1SqoMddOTWhGgURX5ulvz0AGFUatwy4.4nyDQ.OXRxapI_vkr0CDmN1wBkuFXg6mQP1ssGdBdYwa8b5L.plN7ilsEUmr2nOOumq8TWo_e6mtvUOpooBHyUILjSduiru9axePcmlf0zwv7Vi8P_cwhORiCsYRd22bDrtFAJ0wl6xoEIzH5HA2EHSyQ0xxIDEtI.DWJLeREgDCkF3nZ._EHJ2zZIqrMwu9Ee0XgHRFlReIj9B426zfFS3CXdGGljyUmVLSXuyPH.k1yyVGKZTwhnr6hNqDQIoCw48uv1hwG6vKMt9euXwFxIbGw3wKy8tWguJ785oKle.wS6ViWBo2wUEtvpeyamGv5HP_nVx2Uq6xHcTDKQIBwdJXLktKYiSQ1xTDuhVJ35N9o2lP1QVPiCb6t.gKeVHbyx8EBxAj.vLETdxFG937nMFWH1Y5yBjXwycuvxbeJW4plchyHP2.qDLZvQ6xnHvZKk76gjCJpQGr89iaWgdIjY6uhfkNhYGvFhjEYtbpTgxIOTf0cX1i1zP.SIIxf_Aew5iP8nBndD6deMNXnOcf4nqWF8n7yO.BO4P67T_bquYesz.F_O1qCUyu1nZ0p4G4oWLzhnOvI0b8sSzKr81sBKMGjeIdpJm2u.sop_Gkl7XnJzFEnN5GYMzzCKlAhUMYFyLMzQTgTtpAXykQ5tgjUTAiQr0F21TCk1x72qAeS8skfoXdtK8XED4cmPXrjKb5Lm2seSH2C_BtbiuBk4V8eExL5O8xMN4eeswwJj4nzUq1bRk3bBVt3Vg24UagVh1s1g"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=911048836809c93b';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/post\/4590167832?__cf_chl_rt_tk=VROYpAc4koDx3UgpVE38CPEiPPZqT3ImcqNGK6Me1T4-1739402153-1.0.1.1-8kW7NBOVELk38S_rltp1I4KkIcu9a6REsq6tfjFOV_o" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda